The Rising Tide Expansion Pack for Civilization: Beyond Earth
has now been announced, with an expected release date of Fall 2015.
Rising Tide will expand Beyond Earth to new frontiers on the planet's surface and across its seas, adding more choices and diplomatic options as players build "one more turn" toward a new vision for humanity's future. New aquatic gameplay will explore the oceans for colonization by dramatically extending the play space, while an overhauled diplomacy system will provide players with additional layers of dynamic choices and options to shape the diplomatic landscape while engaging with the AI and one another.
Read all about it here
PC Gamer's Samuel Roberts interviews
the lead designers to gain deeper insight.